P2Dgizmo
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Wiki page [P2Dgizmo] by jfk 2012-12-04 10:49:00.
D 2012-12-04T10:49:00.515
L P2Dgizmo
P 2f5b125a00b85c8e98aedf18abe486db5567e8ca
U jfk
W 804
<h2>About</h2>
P2Dgizmo stands for Pulse to DTMF gizmo.

It is a device which teaches a Plain Old Telephone to "sing" modern DTMF.<br>
The original ZIP-file can be downloaded [http://truecard.biz/temp/PulseToTone_2012_01_22.zip|here], and the author also has a demo video available on [http://www.youtube.com/watch?v=ZLoQ5UA1tvc|youtube]

[Notes] -:- [Software]

<h3>Schematics</h3>
<b>Note: the schematics as shown below will not work on European telephone lines.<br>
because European telephone lines do a polarity switch at the end of each call.<br>
(This might be solved with a bridge-rectifier though)<br>
</b><br>
(Click on the image below to get a bigger picture)<br>
<a href="../P2D/doc/tip/Schematic_v1-0.png"><img src="/doc/tip/Schematic_v1-0.png" width="800" height="600" /></a>

Z a51968200fe9135a5e9c6393a95549bd